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首页> 外文期刊>Journal of Materials Science. Materials in Electronics >Fluorescence and infrared spectroscopy of electrochemically self assembled ZnO nanowires: evidence of the quantum confined Stark effect
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Fluorescence and infrared spectroscopy of electrochemically self assembled ZnO nanowires: evidence of the quantum confined Stark effect

机译：电化学自组装ZnO纳米线的荧光和红外光谱：量子受限斯塔克效应的证据

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摘要

We report room temperature fluorescence (FL) and infrared absorption (IR) spectra of spatially ordered two-dimensional arrays of vertically standing ZnO nanowires. The wires are produced by selective electrodeposition of Zn in 10-, 25- and 50-nm pores of a porous anodic alumina film, followed by chemical oxidation. Wires of different diameters show distinctly different FL emission characteristics associated with either deep level traps, or exciton recombination. The intensity of the peak caused by exciton recombination is larger than that caused by deep level traps, which is unusual in nanostructures, and attests to the high structural purity. We also see an anomalous red-shift in the FL emission spectrum which appears to be evidence of quantum confined Stark shift caused by built-in electric fields in the alumina template. The IR absorption spectra are mostly featureless and show no significant peaks indicating the absence of shallow level traps.
机译：我们报告了垂直站立的ZnO纳米线的空间有序二维阵列的室温荧光（FL）和红外吸收（IR）光谱。通过在多孔阳极氧化铝膜的10、25和50 nm孔中选择性电沉积Zn，然后进行化学氧化，可以生产导线。不同直径的导线显示出与深能级陷阱或激子复合相关的明显不同的FL发射特性。由激子复合引起的峰强度大于由深能级陷阱引起的峰强度，这在纳米结构中是不常见的，并证明了其高的结构纯度。我们还看到了FL发射光谱中的异常红移，这似乎是由氧化铝模板中的内置电场引起的量子受限Stark移位的证据。红外吸收光谱大部分没有特征，没有明显的峰，表明没有浅能级陷阱。

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